Comparison with other birefringent crystals
Compared with Calcite, YVO4 has better temperature stability, physical and mechnical properties. And it is hard for Calcite to obtain high optical quality because of its low susceptibility to moisture and low hardness. Compared with Rutile (Tio2) which has high hardness, YVO4 is easier to be handled in optical surface processing which greatly reduces manufacturing cost, especially in batch production. Compared with LiNbO3, although they have similar mechanical and physical properties, YVO4 has three times larger birefringence, which makes your design more compact.
Basic properties of YVO4:
Basic properties of YVO4:
| Transparency Range | High transmittance 0.4-5μm |
| Crystal Symmetry | Zircon Tetragonal，Space groupD4h |
| Lattice Parameters | a=b=7.12A;c=6.29A |
| Density | 4.22g/cm3 |
| Mohs | 5 (glass like) |
| Deliquescence | NO |
| Thermal Expansion Coefficient | αa=4.43×10-6/K ；αc=11.37×10-6/K |
| Thermal Conductivity | //C: 5.23W/m/K ⊥C: 5.10W/m/K |
| Crystal Class | Positive uniaxial with no=na=nb,ne=nc |
| Thermo-optic Coefficient | dno/dT=8.5×10-6/K dne/dT=3.0×10-6/K |
| Refractive Indices Birefringence Coefficient (△ n = ne-no) and Walk Angle at45° | no=1.9929, ne=2.2154, △n=0.2225,p=6.04°at0.63mm no=1.9500, ne=2.1554, △n=0.2054,p=5.72°at1.30mm no=1.9447, ne=2.1486, △n=0.2039,p=5.69°at1.55mm |
| Sellmeier Equation(I in mm)： | no 2 =3.77834+0.069736/（λ2）-0.0108133λ2 -0.04724 ne 2 =4.59905+0.110534/（λ2）-0.0122676λ2 -0.04813 |
Pure YVO4 used in optical circulators and optical beam displacers
| Dimension Tolerance | W(±0.5mm)×H(±0.5mm)×L(±0.1mm)or(±0.003mm) |
| Optical Axis Orientation | ±0.5° |
| Parallelism | <10〞 |
| Perpendicularity | 5′ |
| Flatness | λ/8 @ 632.8 nm |
| Surface Quality | 20/10 MIL-PRF-13830B |
| AR-coating | R<0.2%@1550or1310nm±0.4nm R<0.1%@1064nm For high power laser |
| Standard Size | 5.2×2.5×25mm,θ=45°,Ф=0° |
| Note: Other Sizes and Coating Are Available Upon Request | |
